Where does “som” come from?

som (Old Swedish) comes from Old Norse sem, from Proto-Germanic samaz, from Proto-Indo-European somHós, from Proto-Indo-European sem- — together, one.

Ancestry of “som”, step by step

StepLanguageWordMeaning
1Old Norsesemas, the same, like; inflection of semja: ##...
2Proto-Germanicsamazsame, alike
3Proto-Indo-EuropeansomHóssame, alike
4Proto-Indo-Europeansem-together, one

Words derived from “som

Every word from Proto-Indo-European sem-Every word from Proto-Indo-European somHósEvery word from Proto-Germanic samaz